function decipherThis(str) {
    var Reg = new RegExp(/[0-9]+/)
    return str.split(" ").map(x => {
        x = x.replace(Reg,w=>{return String.fromCharCode(w)})
        if(x.length>2){
            x = x.slice(0,1)+x.charAt(x.length-1)+x.slice(2,x.length-1)+x.charAt(1)
        }
        return x
    }).join(" ")
};

decipherThis("72eva 97 103o 97t 116sih 97dn 115ee 104wo 121uo 100o")
